What we know of it amounts to a brief, accidental glimpse: in 1979, during land reclamation works, a field drain was dug through low-lying ground and exposed portions of ancient field walls that had been sitting, undisturbed, just beneath the surface.

The walls themselves were carefully made. Each consisted of two parallel rows of stone slabs, set on edge and standing around a metre high, with the gap between them, roughly a metre wide, packed with smaller stones, a technique that produced a solid, well-insulated boundary rather than a simple single-skin barrier. One wall ran on a northwest to southeast axis and measured somewhere between eight and ten metres in the exposed section; two further walls extended from it toward the southwest, set approximately five metres apart, suggesting a deliberately laid-out field system rather than any casual arrangement of stones. The geometry implies planning, a division of land into usable parcels, though no date has been established for when this was done. The peat that buried them would have accumulated gradually over a long period, sealing the walls in anaerobic conditions that can preserve organic and structural material remarkably well. Unfortunately, the sections that came to light during the drain construction were destroyed in the process of digging, so what was briefly visible is now gone. The more intriguing possibility is what remains hidden: field walls may still survive beneath the peat cover in the fields adjoining the drain line, preserved simply because no machine has yet reached them.